Good game, well put together.
I found this game useful for shedding the romanji part of learning. It is intended for younger children to help them with hiragana and katakana..however I believe it is important to get to a point in your studies where you learn as a japanese child would, not as an english person learning japanese.

The games are very straight forward even if you do not know Japanese and most give ample opportunity to correct mistakes (you get penalized in th score but most at least allow you to finish the game). There is also a "speak and spell" function where when you press on the hiragana, it displays a word that is associated with that hiragana, a picture of item, and speaks the word outloud to you.

The games focus on many things, including speech recognition (choosing the appropriate word based on hearing a question about the item), switching between katakana and hiragana, phrases appropriate for certain situations, and the order of the vowels and syllables in charts (ka, ki, ku, ke, ko etc).

Good but, maybe only for Japanese
It is aggod game for young kids to learn to speak fluently japanese and to write correctly Hiragana and Katakana, as the game speaks(In Japanese), I think it would be difficult for other country children to play it, yet most pf the mini-games are easy to play no matter the language you speak